In small bowl, combine herbs, garlic, lemon zest, red pepper flakes, and 1/4 cup oil.
Heat remaining tablespoon oil in large frying pan on medium-high. Season pork with 1 teaspoon salt and cook until browned on all sides, 5 to 6 minutes. Brush herb mixture over top and sides of pork.
Add chicken broth and vinegar to skillet, then transfer skillet to oven and roast until pork registers 60°C on instant-read thermometer inserted into thickest part, 18 to 25 minutes. Transfer to cutting board and let rest at least 10 minutes before slicing.
Return frying pan with liquid to medium-low and whisk in mustard and honey. Simmer until slightly thickened, about 5 minutes; remove from heat and whisk in crème fraîche and thyme. Serve over sliced pork.